There are some problems with the electromagnetic flowmeter; please help, experts!
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The EMFM HFD3000 electromagnetic flow meter used for measuring wastewater in our factory has developed a problem; the display shows FGP – does this mean an excitation alarm? How should such problems be solved? Are there any other things to pay attention to during the installation of electromagnetic flowmeters? Is it necessary to ensure that the pipe is always full? Will dissatisfaction with the management burn out the electrodes?
For the code shown in the table header, you can check the manual; the installation requirements are available on Haichuan. Dissatisfaction has an impact on the measurement values, but it has no effect on the electrodes.
This post was last edited by zhaohh3211 on 2012-2-20 at 11:40. A full tube meets the requirements for measurement, not those related to safety; it has no impact on the safety of the electrodes. Excitation alarm: 1. Coil damage ； 2. Caused by contact issues between the transmitter and sensor.
If there is concern that the medium will not fill the pipe, this can be avoided during installation: a U-shaped bend can be added to horizontal pipes to position the gauge at the bottom of the pipe, while in vertical pipes, the medium can be allowed to flow from bottom to top. In wastewater treatment, dirt tends to adhere to the lining on the outer surface of the motor, forming a layer of fouling that needs to be removed.
To meet the requirements for the straight sections before and after, it is generally 5D in front and 3D behind; this varies among different manufacturers, so check the instructions
Haiyou, the excitation alarm is basically due to a problem with the flow meter itself. The main faults are: 1. Damaged excitation coil ； 2. Excitation coil short-circuited to ground ； 3. The excitation generator is damaged ； 4. Damage to the electrode or sensor system ； 5. The electrode is dirty and cannot conduct electricity.
I agree with the second floor’s view; dissatisfaction only affects flow measurement, not the electrodes. Generally, it is only the measured media that tend to form scale that can cause scaling on the electrode surfaces, leading to inaccurate measurements.